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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9879af067e95d7065b84d3ff97861ad00e63d9196f4b8104a3d376a288c5d7' 
  AND token = 'PTMUsCrARVIpbeksXNf1Q6bdLyO8/et+0ujiU2HTIrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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