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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd60486b210fbc9001d2450c0cc554fb7ea012c89c44e8652f1d95eeacbb8f8f' 
  AND token = 'y3Zm8u6RE1Xbc4S2nqjKMsMulQ6x/xaS/bCF97T66yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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