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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc4d975548f0825fa5d476988b1bf48d002ddbbda61e0d414f0104ff78a20d1' 
  AND token = 's0uyNgnKh3GwSEG3Gk6uz7u9OGHpeb3/F0q03Ki4ibs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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