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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17ba462d5a7face78e07f8824f19df5eca681bb87e1423bde41f0720a2e7578' 
  AND token = 'iGBsO+4LBJ7lt5TsYay5S9wBcQXX79ur348uWcFyJTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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