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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f78093183632fbba1440cf7e1704f570e6af6c6207fa24164a6a9d9a6a1b37' 
  AND token = 'c0pWu1A959jzt47gKN3p3HJK4DFfbJOOjSWYZLnKPqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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