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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb9ae96d3e69d85a36649f0582a2bb0d14cc2ba70e262ba7cd5c333f8ae6517' 
  AND token = 'k+LyNLG3J5GFdxV+jBRHyQ8UHh8vOFrEWsmelNsZyf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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