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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb6dbdd0855498cac7a2accac9e605c0c8ace41fc066d83826fa8c61affcb15' 
  AND token = 'Uk3+l3cDpdYHgHqGM97EqPY/3JEIGLpbU0wV2eQsFvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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