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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc497090f2c5567ac65ea0a19f282002399d2ea8a2f526aadeff53db3e6142a' 
  AND token = '2Ti67AjQSvyjTitWkJ/qhVtB0s0w/DepIx39pVvrNFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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