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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7ec74895c7cb9fa76668c78a05fc5764e5e4918158904eb52c2064739c0940' 
  AND token = '8VR8nshjPCV2y3hWPAJ9RT5BHmYiH2PsJvyYXapOKhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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