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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95aabd5f32b7d4969e804a249053d1e1dd742114d831e9d3bf2886532db2b7c' 
  AND token = 'Ml8v2Lc8TYkYweSgqaTWH0z6W5cF4IdnUkgEUFE8lyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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