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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc85706d1eff5cac23c098e2b29ed4f244dea7b003dbdab83a02a0da1f72524' 
  AND token = 'jn0Rt5Ejv91o+CCwfpyCK8nVtwR7jtjMPsu1rcRBvfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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