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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb9aee388dd23578d07975f70043c82c10c4d4713edad70fb5781787940072e' 
  AND token = 'at7/m9hgd41fLk6SMFTuS6f4SQMpe26YgBEHKSVJjcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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