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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7309accde2b2d47d17f584bbf90aafcaac3a5df134dfce6bc97410db4bc0f1' 
  AND token = '1YvSAZNBAuZ31rpEW8/U6gQQ7X1xw5FJS+On32x1MAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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