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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d403a568562948df4e36124966928fc1a654ca3bfc5a778542368161d4b4c8f' 
  AND token = 'p5BJkuIhmz80vVcLiygMJ48sBylm58VvXWNuRdWikrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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