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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fed1f34b170328d2bccd773b253f5741ff19d9f22a63377709f13f485d79b16' 
  AND token = 'saL6Bt42QNfAuCUrvrE4/H0Jc73rNkG7sinoArG9MHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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