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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e3c2fa61cbaeafc1d39a621620c4e5707753f187026d7ebf064670a9b0ba75' 
  AND token = 'zmXiW0mWhhNdgOmijvZVJjg6IgPdTEticO8u68WHNKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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