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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbe23666bb0387a0cd3762fccb95dda8b179b92f0f3ac4cc59f6487ba83b3f9' 
  AND token = 'e7oxT9/zemeDfj+GVBfkssgTOMSdyQ/a/QSC9gBD/yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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