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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173a7068cdbb9ac1e4f8bee0985c90490a7fff1dd34faa0119c33dfce75e4d41' 
  AND token = 'nppknkJO1MnPZffbPC+FpJaJ13sMm4FX7yWJR4WhZhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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