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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07167c8e094bcfc0fe3e0de7178c926398f77e432f28eef9b7161c2a92814206' 
  AND token = '6EXbnNi8xflMPb62J4p/32XTm8R/4s++rBiRm+4NQLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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