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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1573da9783d66daad73be3390d219652a1f2b274ad933f90ddd8ec91758ca9' 
  AND token = 'nDX8qjNst6qMb95gnInpZseSS9ef6YroSfXk6wFaq5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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