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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec6b5d756b2385eda240919a86dbfbc18d0c04e3a5ac4f6f88e019cbbf32413' 
  AND token = 'VZyrTuZ+1+Ipvsr7EGuMpLi3TtWVi/1LFbNX2Lssyfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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