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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff752c7c16583c3585ef0a7233402587853c4363d7c0e36e9c2e334ab0070f1' 
  AND token = 'euO0KZtyBSEx92HUvLOh+cM5GbHTrgacKyI+B+faRn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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