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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903806b33945bb546e9bf45610ac906ccde4ecbc9190fd0a2356cba3a91b9e8d' 
  AND token = 'gMSg4iVFZ5uyebRowZ23k+AdnGH8ti2VSvK031mzmTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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