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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46ba9b3d0e5bccdcd0e4cd78c4a64bf40c3036b90a0cd7342dc465873ed614c' 
  AND token = '28UX+GZac/WuQ0VovetnJXPTDqtKS1GOvHOhnx8YN1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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