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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b623ee7f332e9146a66596226ac6de16526d20b33426c2c430cc54693b9a50d' 
  AND token = 'bniIwxMvAGlX+ucLSRNHENWjkrH/K2eaoN4JSoCVFUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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