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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b08b0d0db1c6f4e5ad737f6b1e277158e60b7dbcdf274da510d94cda45f8d7e' 
  AND token = 'viA77S512BzBHErnk6tf9+95JnmgVf6mwgG6wGyXYvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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