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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0dedc5b0720835298c26c1f19bf8425df584ad4fa2c08bf0418ab6d665ee09' 
  AND token = '9N4+jxKG+EH3JLOodoLapjvK+C84rk8lqfCk7rLDWJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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