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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b978eda629a6fbded0a844386b6ab8afd915d41d8cba0d8a6dc9262a4c89b10' 
  AND token = '7bphGtaP4PUupnCaGgC8pX09Rnc8onqiPB7kRE1XqXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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