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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6701b8c1b422f7dfbb880d95d7689afc03123238f1da44f7f6673a6ad4008902' 
  AND token = 'LHS5oxVIKZAqZj1ucmrs3+3VK7OTr7Nekby8TEqGAYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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