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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317e63f20bbe5b790fde8219780d6184867ea8f5b89d2b9fc3e3cd011bb25247' 
  AND token = '7T2HcfUCk3DMM8deRbcw3Ou6Divt4haDJ42usS7FnmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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