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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9095cc4bb0e0bc6febdc669dc38428d5fbb3069d90bb40a138d75db10b6a513' 
  AND token = 'li+0aO7k/Tli3UA3+AZcnlfvfoPli2GRLmad4KE6tjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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