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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a244f1486d510fd1af8836554a808f61073d6af308d86eae3aa4a141830e83' 
  AND token = 'KH4BxkxmmoJmXV7/LbwWNpQlWmLFmaMQENwaEcsvZeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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