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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf68e14b3e92ce5af98280de680ba44ca638fce7255af5f4794f12eda9207a9e' 
  AND token = 'vIfQQQmANNyaPZ0AuVGlhrZ2Z0ib/GJSD2k0V6qBc4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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