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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093067424dfcf713408af62fb4e6487b81f3e0857c7924543141443e14336b62' 
  AND token = '2EwMfRlsiy3IhefydK7uru/5aUC2twsruiJB2ESYV/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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