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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ab957f8ba8e4c68bd09ed72a8c46ab1c0da83549e6853136eb62fd7acb7bd1' 
  AND token = 'QG4dWUYP6OWoSfu36Xrc4NyHj6+bYf2H06LYK7KiySY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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