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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b123c603f2a75c9e6f41534ba951ff052e1b6fb403c5c02c504426bbb9d3c6c2' 
  AND token = 'rJiNuPWUUc2R2bKUj63SBWgGpbOT/0TzkO3Vd13Ycac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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