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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbabdef50fc6171aba0973e839528338f5947abe0e2f2e86b81223c2a23ede2c' 
  AND token = 'GRxKdSvPah23IjQgt974rIl4hMPHM5OPGjNO/sAnHgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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