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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f871bc1d37cbb76ea4dcffb3f0856bc075a950a13bda7e3e76d2c30dbdcb866' 
  AND token = 'QsUJ/3fjTGKoXTIm+P7vYUqSsAabOQEbHo9baNCr4Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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