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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e203ab60eba7469ef7e4ec9679d46e954fda7b9ac604dd6a0044f1fad2b519' 
  AND token = '9SnjqZ6/HzHowo1UEvRDZDRaRdylrTG5xhezJ14IBbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}