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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e79ba96d97458e2493510f40bb1534e0c29d28124e4c97d5f604995ce84bc19' 
  AND token = 'bLjCW9/q9tWQOmm35UDgendno1cm+2/aFDr3vPpNP7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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