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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a5bb8edc46af932643e346f79c2c5c8d0d71d087ee5f023b09b60a32401a6e' 
  AND token = 'vOjFN3L9KPjLjaJBEXJEII/+t9P5HqS2OV3mi0urWaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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