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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f99a775f78613a1b764c230bdeeb1f6b2fc7b61db1ee85397d3b5ffabc2e75' 
  AND token = 'GADInSsj0qoKMuI2xTMZG8AjQdKnJQKPK/jQcE0Z8As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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