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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4e1e7c55b10f08b5a35ddaf3287c142eb2bef32c311911e88892f9c9335f3e' 
  AND token = 'iQLVLtCVf5CQCuqQCBX5KR+0IQiGZXs2fbyXD3e2+o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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