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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48c01676d2dd6e0ff75a6b1d5a2c1574b446cc093b996ea62438cb3c1dbf60b' 
  AND token = 'bUKQeGSAL2IGwXfrGDQkAVmnCgF+12E8AFEYtr96Ovs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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