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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b90b1f87c1a447bd729bb3996d152501aad775531c1cf4216c9590d9e1a564f' 
  AND token = '803dq2MmmEXay0jXE20BzCTyZXFHkKZDiR84e7Oq3Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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