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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c0b386970c620cf12f9da4b34a09a475fb51d93dc39e62a83237ee0e47edf2' 
  AND token = 'FXjcd4yFqNfc4yk6NWL9j+fssl9rvE82gCnBsYHD2zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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