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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4c15db25c19e53dd92929d15403d586f4136b0dd3cc136da73e4685398ce24' 
  AND token = 'jl7cS4XoFfKy4YB1r3o8B5E7ATnGIrOOc0EC9CEeWuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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