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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193eb281c3ed474c016761cd0c21f6ba3a6b6130e8bafac517346e903bcf610c' 
  AND token = '7cBpmLTx1PHUpNaSfBK4o/nvF3zbPMyccLFL+qAq3ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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