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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed470aea4dd5ecd0376583c1a2ff8d60d2c35fd6d7a5267d42bc06bb3f11029' 
  AND token = 'eLzDqjyw5U+9C/pvw1SLP7WEg56cd4N64dy0Di0iL3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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