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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312e6d0c402cc301d76f2d4770a4e113c98f5e9628482eecd28e92034aff5b8b' 
  AND token = 'zPhV2RJRATtQziJcI5V8yZOCm1TJAohhMwAIme5pXgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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