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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86571a6f626d2d0efae32347eb51534ac3d5c5f40dc2705c19ec79a7ffeb6624' 
  AND token = 'MOtN2zZFSLzzLyExmKZrF8zilR3R0SRBxh36NJUi9AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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