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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcad2067f5f661d99b0ed1d92770f5257fccc8f99d23872f5abec5fc22b3d2c' 
  AND token = 'kS8OX95qeB19855AcsmAZZd2QFR9whyLLsWFPaXplLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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