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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eaebf6e4d5a021a1997a74478789d8366715f8eb950935e35646f0f60a0535f' 
  AND token = '/bIhdleus/kIQoezsm7ftqVOrYj6f5bsclVyjI45GdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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