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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63cc2aefd44f003c0b85cca8d2d75ac9595b2ea8fee0cbeb8f0729feb948336b' 
  AND token = 'o0J4FQR4g0CVjbK3gPZM2DG2gJ02skwklukBSi4fdOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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