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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa8324a01436f8db6b1f44dad8f5b608a51db83ecb8b9a1d0fc12185847d89d' 
  AND token = 'NNcpQbzdTU0mQC2kU2ZwBelA3W2gXc2GtcH6g0/88gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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