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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c7e795bb288d4b01f07ced430a3523f5e112c52fa1d6deed956ef732c13598' 
  AND token = 'datLgWdLKhF07hXR7ZD1HT27bWwNwvz3llUZSBLBd5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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