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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa2d04bb1fea292723ba3a8f81f25cfa462dc043c8c509c9e89423138654b7b' 
  AND token = 'C12PD/VWkukywM2+U2/3Tr9k0UXSdA16Smpy67e7l6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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