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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6de962ff150d129ed499d26c6b72aa3fa9dd02b65947bec0db5a5f9b5d22a9a' 
  AND token = '0aifj27Z7jRTiae5bMkWEOFdAcki7mAO1kg3ye52Ugk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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