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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e34851a323a9ed243ffc73bafb788f66137a34a4f24d88c66052e64938e5fa0' 
  AND token = 'WTSebcy2vb2Ef5z3U/TKTnt27xZ6WNL2HBN3wGPWms8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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